Robtex

Up: 66.218.85.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 66.218.85.0/26
Down right: 66.218.85.64/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.218.85.0	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.5	PTR	vl121.slb1-1-lba.bf1.yahoo.com
66.218.85.6	PTR	vl121.slb2-1-lba.bf1.yahoo.com
66.218.85.8	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.9	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.17	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.18	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.19	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.21	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.22	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.26	PTR	prod4cws2.xobni.vip.bf1.yahoo.com
66.218.85.26	A	extesb.gapx.yahoodns.net
66.218.85.26	A	extesb.apx.yahoodns.net
66.218.85.27	A+PTR	w3.lrs.vip.bf1.yahoo.com
66.218.85.28	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.28	A	adminuia10.adx.vip.bf1.yahoo.com
66.218.85.30	PTR	stgwsc.gsm.search.vip.bf1.yahoo.com
66.218.85.31	PTR	gdb2.kon.vip.bf1.yahoo.com
66.218.85.33	PTR	netews51a10.adx.vip.bf1.yahoo.com
66.218.85.35	A+PTR	jpop400-aol-sec.mail.vip.bf2.yahoo.com
66.218.85.35	A	global-jpop-aol.mail.gm0.yahoodns.net
66.218.85.38	PTR	rc-mw3.diy.vip.bf1.yahoo.com
66.218.85.39	PTR	gw.llfs.new.vip.bf1.yahoo.com
66.218.85.41	PTR	kubeingressplus1.mail-canary1.omega.vip.bf1.yahoo.com
66.218.85.42	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.42	A	amt1-ngn.flickr.vip.bf1.yahoo.com
66.218.85.44	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.44	A	fts-ngn.flickr.vip.bf1.yahoo.com
66.218.85.44	A	flickr.yahoo.fr
66.218.85.45	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.46	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.47	A+PTR	proxy1.gdpr.vip.bf1.yahoo.com
66.218.85.48	PTR	kubeingress1.canary1.omega.vip.bf1.yahoo.com
66.218.85.49	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.51	PTR	kubeingress1.prod1.omega.vip.bf1.yahoo.com
66.218.85.52	PTR	unknown.yahoo.com
66.218.85.52	A	mta-v41.mail.vip.bf1.yahoo.com
66.218.85.52	A	mta7.am0.yahoodns.net
66.218.85.53	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.55	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.56	A+PTR	search2.store.vip.bf1.yahoo.net
66.218.85.58	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.59	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.61	PTR	opp2.store.vip.bf1.yahoo.com
66.218.85.62	A+PTR	cud2.sbs.vip.bf1.yahoo.com
66.218.85.63	PTR	unknown.yahoo.com
66.218.85.63	A	lib3.store.vip.bf1.yahoo.net
66.218.85.65	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.66	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.67	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.68	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.69	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.72	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.73	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.74	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.76	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.77	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.78	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.79	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.80	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.82	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.84	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.86	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.88	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.89	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.90	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.91	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.93	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.102	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.107	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.108	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.110	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.111	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.112	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.114	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.115	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.119	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.120	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.123	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.124	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.125	PTR	unknown-66-218-85-x.yahoo.com
66.218.85.127	PTR	unknown-66-218-85-x.yahoo.com